<?php

/**
 * Filter handler for usernames
 */
class views_handler_filter_user_name extends views_handler_filter_in_operator {

    var $no_single = TRUE;

    function value_form(&$form, &$form_state) {
        $values = array();
        if ($this->value) {
            $result = db_query("SELECT * FROM {users} u WHERE uid IN (" . implode(', ', $this->value) . ")");
            while ($account = db_fetch_object($result)) {
                if ($account->uid) {
                    $values[] = $account->name;
                } else {
                    $values[] = 'Anonymous'; // Intentionally NOT translated.
                }
            }
        }

        sort($values);
        $default_value = implode(', ', $values);
        $form['value'] = array(
            '#type' => 'textfield',
            '#title' => t('Usernames'),
            '#description' => t('Enter a comma separated list of user names.'),
            '#default_value' => $default_value,
            '#autocomplete_path' => 'admin/views/ajax/autocomplete/user',
        );

        if (!empty($form_state['exposed']) && !isset($form_state['input'][$this->options['expose']['identifier']])) {
            $form_state['input'][$this->options['expose']['identifier']] = $default_value;
        }
    }

    function value_validate(&$form, &$form_state) {
        $values = drupal_explode_tags($form_state['values']['options']['value']);
        $uids = $this->validate_user_strings($form['value'], $values);

        if ($uids) {
            $form_state['values']['options']['value'] = $uids;
        }
    }

    function accept_exposed_input($input) {
        $rc = parent::accept_exposed_input($input);

        if ($rc) {
            // If we have previously validated input, override.
            if (isset($this->validated_exposed_input)) {
                $this->value = $this->validated_exposed_input;
            }
        }

        return $rc;
    }

    function exposed_validate(&$form, &$form_state) {
        if (empty($this->options['exposed'])) {
            return;
        }

        if (empty($this->options['expose']['identifier'])) {
            return;
        }

        $identifier = $this->options['expose']['identifier'];
        $values = drupal_explode_tags($form_state['values'][$identifier]);

        $uids = $this->validate_user_strings($form[$identifier], $values);

        if ($uids) {
            $this->validated_exposed_input = $uids;
        }
    }

    /**
     * Validate the user string. Since this can come from either the form
     * or the exposed filter, this is abstracted out a bit so it can
     * handle the multiple input sources.
     */
    function validate_user_strings(&$form, $values) {
        $uids = array();
        $placeholders = array();
        $args = array();
        $results = array();
        foreach ($values as $value) {
            if (strtolower($value) == 'anonymous') {
                $uids[] = 0;
            } else {
                $missing[strtolower($value)] = TRUE;
                $args[] = $value;
                $placeholders[] = "'%s'";
            }
        }

        if (!$args) {
            return $uids;
        }

        $result = db_query("SELECT * FROM {users} WHERE name IN (" . implode(', ', $placeholders) . ")", $args);
        while ($account = db_fetch_object($result)) {
            unset($missing[strtolower($account->name)]);
            $uids[] = $account->uid;
        }

        if ($missing) {
            form_error($form, format_plural(count($missing), 'Unable to find user: @users', 'Unable to find users: @users', array('@users' => implode(', ', array_keys($missing)))));
        }

        return $uids;
    }

    function value_submit() {
        // prevent array filter from removing our anonymous user.
    }

    // Override to do nothing.
    function get_value_options() {
        
    }

    function admin_summary() {
        // set up $this->value_options for the parent summary
        $this->value_options = array();

        if ($this->value) {
            $result = db_query("SELECT * FROM {users} u WHERE uid IN (" . implode(', ', $this->value) . ")");

            while ($account = db_fetch_object($result)) {
                if ($account->uid) {
                    $this->value_options[$account->uid] = $account->name;
                } else {
                    $this->value_options[$account->uid] = 'Anonymous'; // Intentionally NOT translated.
                }
            }
        }

        return parent::admin_summary();
    }

}
